Gout: Acute Management & Allopurinol Prophylaxis
Why you never start allopurinol during a flare, how colchicine works, and NSAID safety for vulnerable patients — NICE-aligned guide.
Gout is the most common inflammatory arthritis in the UK, affecting around 2.5% of the population. It is not — despite common misconceptions — simply a “rich man’s disease” or the result of overindulgence. It is a chronic metabolic condition where monosodium urate crystals form in joints, triggering excruciatingly painful inflammatory attacks. And yet it is also one of the most mismanaged conditions: allopurinol started during a flare, stopped and started repeatedly, or prescribed without patient education — all of which make things worse.
As a nurse, you will see acute gout flares regularly — on surgical wards, medical wards, in A&E. Knowing what to give, what to delay, and what to teach the patient could save them months of recurrent pain. This guide covers acute treatment, urate-lowering prophylaxis, and the critical rules that prevent harm — fully aligned with NICE guidance.
1. National Guidance
All content aligned with: NICE Guideline NG219 — Gout: Diagnosis and Management (2022). Drug doses, duration, and escalation cross-referenced with current BNF Chapter 10.1.3.
📎 Source: NICE NG219 — Gout: Full Guideline
⚠️ Local prescribing formularies vary. Colchicine dose, NSAID choice, and first-line prophylaxis may differ by trust. Always check the current BNF and local policy.
2. What Actually Is Gout — and Why It Flares
Gout develops when serum urate exceeds its saturation point (~360 µmol/L) — crystals form and deposit, typically in peripheral joints where temperature is lower. The body reacts as if invaded by foreign material → intense inflammation, redness, swelling, and pain so severe even bedsheets feel unbearable.
Risk Factors & Triggers
- Hyperuricaemia: Overproduction or underexcretion of uric acid — by far the strongest predictor
- Diuretic use: Thiazides and loop diuretics reduce uric acid excretion — extremely common trigger in older adults. See heart failure medications
- Renal impairment: Reduced eGFR = reduced clearance — dose adjustments essential
- Diet & alcohol: Purine-rich foods (red meat, shellfish), fructose-sweetened drinks, beer and spirits
- Comorbidities: Hypertension, obesity, Type 2 diabetes, metabolic syndrome, ischaemic heart disease
- Rapid changes in urate: This is critical — dropping urate too fast triggers flares. Hence the golden rule: do NOT start allopurinol during an acute attack.
Typical Presentation
- First metatarsophalangeal joint (big toe) in ~50% of initial attacks — podagra
- Also common: ankles, knees, midfeet, wrists, elbows
- Onset rapid — maximum intensity within 12–24 hours
- Joint: red, swollen, hot, exquisitely tender
- Systemic upset possible: fever, malaise — can mimic sepsis so keep infection in mind
3. Acute Flare — What to Give & When
Treat acute attacks immediately — within 24 hours where possible. The goal is rapid suppression of inflammation, not urate lowering. NICE recommends one of three first-line options:
| Treatment | Standard Dose | Nursing Critical Points |
|---|---|---|
| NSAID — first-line (no contraindications) | Naproxen 500 mg BD or Ibuprofen 400 mg TDS — usually 1–2 weeks total | Always co-prescribe a PPI for GI protection. Review GI risk. Avoid if renal impairment, heart failure, active ulcer. |
| Colchicine — if NSAIDs unsuitable | 500 µg BD or TDS — start within 24–36h. Max 2.5 mg/day initially; reduce as flare settles | Diarrhoea = dose-limiting side effect — warn patient to report it immediately and stop or reduce. Renal dose adjustment vital. Narrow therapeutic index. |
| Oral Corticosteroid — if both NSAID & colchicine contraindicated | Prednisolone 20–30 mg daily for 5–7 days | Abrupt withdrawal from short course generally safe but monitor for rebound. Check blood glucose — see steroid safety. |
Allopurinol lowers urate rapidly → existing crystals destabilise → attack becomes worse and prolonged. If the patient is already established on allopurinol and stable, continue it at the same dose during the flare. Only newly initiating urate-lowering therapy must wait until the acute attack has fully settled — typically 1–2 weeks after symptoms resolve.
Colchicine Deep Dive — Often Misunderstood
Colchicine is not an analgesic — it does not numb pain. It works by binding to tubulin in white blood cells, stopping them migrating into the joint and releasing inflammatory chemicals. It is slow-acting but effective, and safe in renal function if dose-adjusted.
- Onset: 12–24 hours — peak effect 2–4 days
- Renal caution: eGFR 30–50 → max 1 mg/day; eGFR <30 → seek specialist advice; avoid in severe impairment
- GI warning: 80% of patients get diarrhoea at full dose — tell them it’s the drug working, not an infection, and to reduce or stop rather than struggle through
- Interactions: Statins, fibrates, digoxin — can cause myopathy. Check every new prescription
📎 Source: NICE NG219 — Acute Treatment
4. Prophylaxis — Allopurinol & Urate-Lowering Therapy
Allopurinol is the first-choice long-term prevention in the UK. It inhibits xanthine oxidase — the enzyme that makes uric acid — and lowers serum urate gradually over weeks to months. The goal is to keep serum urate below 300 µmol/L (or 360 µmol/L in less severe disease) so no new crystals form and existing ones dissolve over time.
Initiation — The Step-Up Protocol
NICE emphasises starting low and going slow — this minimises the risk of triggering a flare as urate falls:
| Phase | Dose | Monitoring & Action |
|---|---|---|
| Start | Allopurinol 100 mg once daily | Wait 4–6 weeks before rechecking urate — effect is not instant |
| Titrate | Increase by 50–100 mg every 4–6 weeks if target not reached | Check serum urate each time before increasing. Renal dose adjustment applies — see below |
| Maintain | Usual range 200–300 mg/day; can go higher if needed | Once target achieved → monitor annually. Do not stop — lifelong therapy for most patients |
Renal Dose Adjustment — Non-Negotiable
Allopurinol and its active metabolite are renally cleared. Falling eGFR means dose must fall — toxicity risk rises sharply:
- eGFR 60+ → usual doses as above
- eGFR 30–59 → max 200 mg/day, slower titration
- eGFR 15–29 → max 100–200 mg/day, seek renal input
- eGFR <15 → specialist decision — use with extreme caution
Cover During Initiation — Preventing the “First-Flare”
Because starting allopurinol can itself trigger an attack, NICE recommends offering prophylactic cover for up to 6 months after starting or titrating:
- Colchicine 500 µg BD — preferred option where renal function allows
- Low-dose NSAID with GI protection — second choice if colchicine unsuitable
- Explain clearly: “This is to stop the tablets causing a flare — not treating one”
When to Offer Prophylaxis
Don’t wait for irreversible damage. NICE recommends offering allopurinol to anyone with:
- ≥2 attacks in 12 months
- Tophi visible or palpable (hard white lumps of urate crystals under skin)
- Joint damage visible on X-ray
- Renal impairment or uric acid stones
- Diuretic therapy that cannot be stopped
📎 Source: NICE NG219 — Prophylaxis & Monitoring
Febuxostat — The Second Line
If allopurinol not tolerated or ineffective, febuxostat is the alternative — more potent urate reduction but higher cardiovascular monitoring requirement. Check baseline ECG and review annually. Not first-line due to cost and safety profile.
5. Patient Education — What They Need to Know to Stay Well
Gout management fails because patients stop tablets when pain stops. These are your teaching priorities:
- “Allopurinol is NOT painkillers.” It won’t stop an attack that’s already started — it stops the next one. It takes months to work fully. Stopping it lets urate bounce back and flares return.
- “Keep taking it even when your joints feel fine.” The silent work happens when nothing hurts. Most people stay on it lifelong — like blood pressure tablets.
- “Tell every prescriber you see.” Diuretics, some antibiotics, and chemotherapy can trigger flares. Flag it at every admission — see medication review principles.
- “Colchicine diarrhoea is expected.” It’s not food poisoning — it means the dose is high for you. Reduce it and tell your team, don’t just struggle on.
- “Lifestyle supports the tablets.” Limit beer and spirits, sugary drinks, and very high-purine foods; stay well hydrated; gradual weight loss helps but avoid crash diets (they raise urate).
6. Red Flags & When to Escalate
Gout usually settles well with treatment — but these signs mean it’s not straightforward and needs urgent review:
| Clinical Trigger | Risk | Immediate Nursing Action |
|---|---|---|
| Uncertain diagnosis — fever, rigors, raised WCC | Septic arthritis — can look identical but destroys joints in hours | Refer urgently for joint aspiration. Never assume “just gout” in a systemically unwell patient — escalate if NEWS2 rising. |
| Severe renal impairment needing treatment | Colchicine/allopurinol toxicity risk high | Seek pharmacy/renal advice. Do not prescribe standard doses — toxicity presents as GI upset, neuropathy, bone marrow suppression. |
| Allopurinol hypersensitivity — rash, fever, eosinophilia | Severe cutaneous adverse reaction (SCAR) — rare but life-threatening | Stop drug immediately. Do NOT rechallenge. Advise patient to carry alert card forever. |
| Multiple tophi, recurrent flares despite treatment | Treatment failure — may need second-line or specialist input | Check adherence first — are they actually taking it? Review doses and recent diuretic changes. Refer to rheumatology. |
📎 Source: NICE NG219 — Red Flags & Referral
7. Special Situations
- Post-op/surgical patients: Dehydration, immobilisation, and IV fluids can all trigger flares. Continue established allopurinol. Treat flares aggressively but cautiously — avoid high-dose NSAIDs post-op where possible; colchicine or low-dose steroids often safer combination.
- Diuretic-associated gout: If diuretic cannot be stopped (e.g. heart failure), allopurinol dose will likely need to be higher to reach target. Don’t accept “gout is a side effect — nothing to be done” — dose adjustment works.
- Renal stones: Uric acid stones form in acidic urine — high fluid intake + potassium citrate may help. Allopurinol still first-line.